--- title: IPv4 ECMP Works on Arista cEOS Release 4.35.2F «... description: Arista cEOS release 4.35.2F now supports IPv4 ECMP for forwarded traffic, a limitation that existed in earlier versions due to the Linux kernel only installing... canonical: https://daily.dev/posts/ipv4-ecmp-works-on-arista-ceos-release-4-35-2f-ipspace-net-blog-axt91f0av twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: IPv4 ECMP Works on Arista cEOS Release 4.35.2F « ipSpace.net blog | daily.dev og:description: Arista cEOS release 4.35.2F now supports IPv4 ECMP for forwarded traffic, a limitation that existed in earlier versions due to the Linux kernel only installing... og:url: https://daily.dev/posts/ipv4-ecmp-works-on-arista-ceos-release-4-35-2f-ipspace-net-blog-axt91f0av og:image: https://api.daily.dev/og/posts/axT91f0av.png og:image:alt: IPv4 ECMP Works on Arista cEOS Release 4.35.2F « ipSpace.net blog og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # IPv4 ECMP Works on Arista cEOS Release 4.35.2F « ipSpace.net blog **[ipSpace.net Blog](https://daily.dev/sources/ipspace)** · 2 min read · 0 upvotes · 0 comments ## Summary Arista cEOS release 4.35.2F now supports IPv4 ECMP for forwarded traffic, a limitation that existed in earlier versions due to the Linux kernel only installing a single equal-cost path into the forwarding table. Testing with an anycast MPLS/OSPF lab topology confirms traffic spreads across multiple nodes. However, a curious discrepancy remains: the EOS routing table shows two ECMP paths, while the underlying Linux routing table shows only one. As a result, ECMP works for forwarded traffic but not for locally originated traffic from the cEOS device itself. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### Does Arista cEOS support IPv4 ECMP and which release fixed it? Arista cEOS supports IPv4 ECMP for forwarded traffic starting with release 4.35.2F. Earlier versions running the Linux kernel for IP forwarding would only install a single equal-cost path into the Linux forwarding table. The EOS routing table correctly shows multiple ECMP paths, but the underlying Linux table still shows only one entry, so locally originated traffic does not use all paths. _Network engineers validating cEOS behavior for lab or production designs track version-specific quirks like this on daily.dev._ ### Why does Arista cEOS show ECMP in the EOS routing table but only one path in the Linux routing table? On Arista cEOS, the EOS IP routing table can show multiple equal-cost paths (e.g., two next-hops for an anycast prefix), while the underlying Linux routing table via 'bash ip route show' displays only a single entry. Despite this, ECMP still functions for forwarded transit traffic, but locally originated traffic from the cEOS device itself uses only the single path visible in the Linux table. _Engineers debugging cEOS data-plane behavior find real-world observations like this faster through daily.dev than vendor docs alone._ ## Similar posts on daily.dev - [Arista cEOS Does Not Apply ACLs to Control-Plane Traffic « ipSpace.net blog](https://daily.dev/posts/arista-ceos-does-not-apply-acls-to-control-plane-traffic-ipspace-net-blog-ieh2uzhm7) · ipSpace.net Blog · 0 upvotes · 0 comments - [Multivendor SR-MPLS « ipSpace.net blog](https://daily.dev/posts/multivendor-sr-mpls-ipspace-net-blog-qekokwduk) · ipSpace.net Blog · 0 upvotes · 0 comments - [EVPN with SR-MPLS Core « ipSpace.net blog](https://daily.dev/posts/evpn-with-sr-mpls-core-ipspace-net-blog-taobtibzc) · ipSpace.net Blog · 0 upvotes · 0 comments --- Tags: [#linux](https://daily.dev/tags/linux), [#networking](https://daily.dev/tags/networking) [View this post on daily.dev](https://daily.dev/posts/ipv4-ecmp-works-on-arista-ceos-release-4-35-2f-ipspace-net-blog-axt91f0av) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"IPv4 ECMP Works on Arista cEOS Release 4.35.2F « ipSpace.net blog","url":"https://daily.dev/posts/ipv4-ecmp-works-on-arista-ceos-release-4-35-2f-ipspace-net-blog-axt91f0av","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/ipv4-ecmp-works-on-arista-ceos-release-4-35-2f-ipspace-net-blog-axt91f0av"},"datePublished":"2026-08-11T08:52:23.957Z","dateModified":"2026-08-24T06:58:57.468Z","description":"Arista cEOS release 4.35.2F now supports IPv4 ECMP for forwarded traffic, a limitation that existed in earlier versions due to the Linux kernel only installing...","image":"https://media.daily.dev/image/upload/s--58gMhC4P--/f_auto/v1722860399/public/Placeholder%2012","thumbnailUrl":"https://media.daily.dev/image/upload/s--58gMhC4P--/f_auto/v1722860399/public/Placeholder%2012","isAccessibleForFree":true,"articleSection":"ipSpace.net Blog","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"ipSpace.net Blog","logo":"https://media.daily.dev/image/upload/s--xS7E82MT--/f_auto,q_auto/v1786438303/logos/ipspace?_a=BAMAMicg0","url":"https://daily.dev/sources/ipspace"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/ipv4-ecmp-works-on-arista-ceos-release-4-35-2f-ipspace-net-blog-axt91f0av","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"linux,networking","timeRequired":"PT2M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"ipSpace.net Blog","item":"https://daily.dev/sources/ipspace"},{"@type":"ListItem","position":3,"name":"IPv4 ECMP Works on Arista cEOS Release 4.35.2F « ipSpace.net blog"}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/ipv4-ecmp-works-on-arista-ceos-release-4-35-2f-ipspace-net-blog-axt91f0av#faq","mainEntity":[{"@type":"Question","name":"Does Arista cEOS support IPv4 ECMP and which release fixed it?","acceptedAnswer":{"@type":"Answer","text":"Arista cEOS supports IPv4 ECMP for forwarded traffic starting with release 4.35.2F. Earlier versions running the Linux kernel for IP forwarding would only install a single equal-cost path into the Linux forwarding table. The EOS routing table correctly shows multiple ECMP paths, but the underlying Linux table still shows only one entry, so locally originated traffic does not use all paths. Network engineers validating cEOS behavior for lab or production designs track version-specific quirks like this on daily.dev."}},{"@type":"Question","name":"Why does Arista cEOS show ECMP in the EOS routing table but only one path in the Linux routing table?","acceptedAnswer":{"@type":"Answer","text":"On Arista cEOS, the EOS IP routing table can show multiple equal-cost paths (e.g., two next-hops for an anycast prefix), while the underlying Linux routing table via 'bash ip route show' displays only a single entry. Despite this, ECMP still functions for forwarded transit traffic, but locally originated traffic from the cEOS device itself uses only the single path visible in the Linux table. Engineers debugging cEOS data-plane behavior find real-world observations like this faster through daily.dev than vendor docs alone."}}]} ```